<?php
/**
 * Slipstream :: Highly adaptive dependency injection framework
 * Copyright 2010-2011 Ian Unruh (Xerof3ar)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Slipstream\Infrastructure\Parameter;

use SplObjectStorage;
use Slipstream\Configuration\ParameterPolicy;
use Slipstream\Activation\SessionInterface;

/**
 *
 *
 * @author Ian Unruh (Xerof3ar) <ianunruh@gmail.com>
 * @since Class avaliable since release 1.0
 */
class TypehintResolver implements ResolverInterface
{
	/**
	 * Resolves the value of a parameter given a resolution context
	 *
	 * @param ResolutionContext $resolution
	 * @return void
	 */
	public function resolveValue(ResolutionContext $resolution)
	{
		$parameter = $resolution->getParameter();
		$typehintClass = $parameter->getClass();
		if(is_null($typehintClass)) {
			return;
		}
		$typehintType = $typehintClass->getName();
		
		$session = $resolution->getSession();
		
		$container = $session->getContainer();
		$targetContext = $session->getTargetContext();
		
		try {
			$instance = $container->getInstanceByContext($typehintType, $targetContext);
			
			$resolution->setValue($instance);
			$resolution->setResolved(true);
		} catch(LogicException $ex) {
			// Swallow the exception if container fails to create instance
			// from typehint; this will allow other resolvers to get a try
		}
	}
}